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- In: M. Welker, & C. Wünsch (Eds.), Die Online-Inhaltsanalyse: Von der Konzeption über die Datenerhebung bis zur Auswertung (S. 191-223). Köln: Herbert von Halem Verlag.
- In: McKenzie B (ed.): Medicine and the Internet (3rd edition), Oxford University Press, pp. 211-225
In: Lynn, P. (ed.), Methodology of Longitudinal Surveys.
Data has been last edited on Mar 10 2013